we never saw their organizers but they manage to do well in florida. has there been any data or studies about the effectiveness of mail versus door-to-door operations? >> yeah. a lot of the get out the vote tools are delivered over mail. that's one way that for a lot of psychological interventions you can give people information in a highly targeted way. one of the things is use of social pressure. behavioral science. if you let people know whether or not the vote is public, it's on file, their neighbors can know and judge them, is really effective. the way you can deliver that message is send a letter saying here is your vote history. here is your neighbor's vote history. >> that, i think, in the gerber and green stuff, it's most effective in terms of driving turnout. sketch out for us what is happening right now. what is tuesday going to look like if you could sketch for us for the people who aren't going to be on the ground in swing states, what the turnout operation looked like. >> yeah. obviously, early vote changed the rhythm of this. you have st